nothing to do with ECU...
If you are trying to put HID Kit or even a rebased HID Kit into a halogen headlights of course you are not going to get brighter or brightness out of it.
Simple as that halogen is made for halogen equiped headlights and hid is made for hid equiped headlights....
didn't put a fuse relay for your wiring harness???
Only reason i don't like aftermarket or rebased HID kit is the bulbs are generic so it can go out anytimes... Phillips/Osram guarntess 2000-2500 hours of useage. Also rebased kit tend to be bigger, my HID Kit is very slim and nice w/ built in igniter... also got set of IS300 Koito HID Kit with Osram bulbs for $100 ... i think the Koito might be the silmist HID Kit i have seen..
I had h4/9003 rebased hid kit in my car with glare shield... good light, but once you go retro ...you'll kick yourself.